Unit housing for motor unit

Abstract

A unit housing for a motor unit includes a substantially cylindrical housing body, an end housing, and connectors. The end housing has a peripheral wall and an end wall. The connectors include bolts to connect respectively 3-phase power lines to the lead wires led from the ring-shaped stator. The peripheral wall includes a recess to secure an insulating space between an inner surface of the peripheral wall and each of the connectors. The recess is provided in the inner surface of the peripheral wall at a position close to the connectors. The inner surface of the peripheral wall is provided to linearly extend from a bottom surface of the recess toward an opening end of the peripheral wall.

What is claimed is: 
     
       1. A unit housing for a motor unit, the unit housing comprising:
 a substantially cylindrical housing body including a ring-shaped stator and lead wires wound around the ring-shaped stator; 
 an end housing made of a metal, the end housing being butted and coupled to an end surface of the substantially cylindrical housing body and covering an axial end of the substantially cylindrical housing body, the end housing having a peripheral wall and an end wall, the peripheral wall being coupled to the substantially cylindrical housing body, the end wall extending in an axially continuous form from the peripheral wall; and 
 connectors including bolts to connect respectively 3-phase power lines to the lead wires led from the ring-shaped stator, each of the connectors being disposed inside the end housing, the 3-phase power lines being led in the unit housing from an outside through the end wall, wherein 
 the peripheral wall includes a recess to secure an insulating space between an inner surface of the peripheral wall and each of the connectors, the recess being provided in the inner surface of the peripheral wall at a position close to the connectors, and 
 the inner surface of the peripheral wall being provided to linearly extend from a bottom surface of the recess toward an opening end of the peripheral wall, 
 wherein the peripheral wall includes a first inner surface and a second inner surface, 
 wherein the first inner surface is provided at the opening end of the peripheral wall, 
 wherein the second inner surface is provided closer to the bottom surface of the recess than the first inner surface, and 
 wherein the first inner surface is provided below the second inner surface when viewed from an axial direction of the substantially cylindrical housing body. 
 
     
     
       2. The unit housing for the motor unit according to  claim 1 , wherein
 a working hole through which the bolt is tightened is provided in the bottom surface of the recess at a position facing the connector, and 
 the working hole is closed by a cover member in a detachable manner. 
 
     
     
       3. The unit housing for the motor unit according to  claim 2 , further comprising:
 a terminal holding block made of an insulating material and mounted to the end housing, the terminal holding block having a plurality of cylindrical holder portions which respectively correspond to the 3-phase power lines, each of the cylindrical holder portions penetrating through the end wall of the end housing from an outside to an inside of the end housing, wherein 
 the cylindrical holder portions respectively hold conducting terminals that are to be connected to the 3-phase power lines, each of the cylindrical holder portions having a cutout through which the bolt is placed, the cutout being provided in a part of a peripheral wall of the holder portion, and 
 terminals of the lead wires on a stator side are respectively overlaid on the conducting terminals inside the cylindrical holder portions, the terminals of the lead wires being respectively fastened to the conducting terminals by the bolts provided in the cutouts. 
 
     
     
       4. The unit housing for the motor unit according to  claim 3 , wherein the 3-phase power lines are led in the unit housing from an outside while being bent along the peripheral wall and the end wall of the end housing, the 3-phase power lines being respectively connected to the conducting terminals in the holder portions at an outside of the end wall. 
     
     
       5. The unit housing for the motor unit according to  claim 1 , wherein an outline of the bottom surface of the recess is provided radially outward of an outline of the opening end of the peripheral wall when viewed from an axial direction in which the substantially cylindrical housing body extends.